[Feature] Navigation results

[BurkusCat]

Is your feature request related to a problem? Please describe.
When navigating to a page, it doesn't always happen successfully. It would be good if the page/service performing the navigation, was able to handle the result.

Describe the solution you'd like
The navigation service methods could be updated to return Task<NavigationResult>. The result can be ignored if the caller wishes e.g.

await navigationService.Push(...);
_ = await navigationService.Push(...);

Does the first line in the example above generate any warnings in compiler?

Describe alternatives you've considered
Try/catches on calls to navigation service.

Proposed APIs
If possible, try to propose how the API might look. For example:

// NavigationResult
public bool IsSuccess { get; }

public Exception Exception { get; }

Additional context
It is probably a good idea to support two different styles of error handling. This new method is one of them, another way is allowing any failed navigation to throw exceptions instead of returning a result.

Builder configuration: ThrowOnNavigationFailure, instead of catching a navigation exception and returning a result, it should rethrow the exception

• Default is false?
• What would be the best default?